It is much easier to get good coverage in tight areas and lawns surrounded by nontarget surfaces with a liquid. Especially if precision conventional equipment is used. Spreaders and granules are fast if where it lands is no problem. I also like the choice and ability to match the application to the individual site. If a lawn needs a high herbicide rate and low fertilizer, no big deal. Or if part of the lawn does not need preemergent at all.

What about treating areas around curbs with liquid and the rest of the yard with the granular preemergent? To expensive?

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I think it is much more efficient to do it with one application. Not granules for the open areas, then having to go back or worse still trying to do everything all at once. It is ok to tank mix ferts, pre's and post's in a liquid but I do not agree with multitasking. You've only got two hands. For me, I have seen a difference in consistency of control with granules, that is why I do not even entertain them.